https://issues.dlang.org/show_bug.cgi?id=22315

I'm on the fence about implementing this. On the one hand, I can do it and make it work. On the other hand, the C11 way is to use _Alignas, and that's 10 years old now. How far do we go with implementing all the nutburger obsolete C extension cruft out there?

On Tuesday, 28 September 2021 at 06:05:04 UTC, Walter Bright wrote:
> How far do we go with implementing all the nutburger obsolete C extension cruft out there?

The whole point of importc is compatibility, no?  So I say: all the way.

On Tuesday, 28 September 2021 at 06:30:09 UTC, Elronnd wrote:
> On Tuesday, 28 September 2021 at 06:05:04 UTC, Walter Bright wrote:
>> How far do we go with implementing all the nutburger obsolete C extension cruft out there?
>
> The whole point of importc is compatibility, no?  So I say: all the way.

I second this, otherwise it's sort of pointless if it isn't entirely compatible.

Lua, sljit, zlib, xlib don't use it.

Got to page 10 on GH and didn't find anything that used it.

This can probably be tabled until we find a library that needs it.

On Tuesday, 28 September 2021 at 06:30:09 UTC, Elronnd wrote:
> On Tuesday, 28 September 2021 at 06:05:04 UTC, Walter Bright wrote:
>> How far do we go with implementing all the nutburger obsolete C extension cruft out there?
>
> The whole point of importc is compatibility, no?  So I say: all the way.

Compatibility with what? Are there projects using pragma pack as part of a stable API?

On Tuesday, 28 September 2021 at 06:05:04 UTC, Walter Bright wrote:
> https://issues.dlang.org/show_bug.cgi?id=22315
>
> I'm on the fence about implementing this. On the one hand, I can do it and make it work. On the other hand, the C11 way is to use _Alignas, and that's 10 years old now. How far do we go with implementing all the nutburger obsolete C extension cruft out there?

If it's not too much work I think you might as well implement it but an error/warning message must be issued if it is ignored.

__Import__ C must not lie about what it can or cannot do because (in the hands of 99% of its users) it is not going to be used as a C compiler, but rather a C compiler being deployed to properly consume C header files.

On Tuesday, 28 September 2021 at 06:05:04 UTC, Walter Bright wrote:
> https://issues.dlang.org/show_bug.cgi?id=22315
>
> I'm on the fence about implementing this. On the one hand, I can do it and make it work. On the other hand, the C11 way is to use _Alignas, and that's 10 years old now. How far do we go with implementing all the nutburger obsolete C extension cruft out there?

I tried ImportC with TCC and warp as preprocessor.
TCC stdlib uses #pragma pack also.
The conundrum with ImportC is that it seems to me you have to build with the right cstdlib headers if you intend to use this or that backend.
So in the end I managed to convert none of the STB headers libraries with ImportC (not only due to pragma pack).